This is Pittosporum eugenioides, also known as Lemonwood tree, and Tarata. This tree is highly sought after for its fragrance. The Maori of New Zealand have been using this tree to make scented oils and other products. The leaves and flowers can be crushed up to produce the most wonderful smell. Many people use this tree as a screen because it grows very fast, is an evergreen, and can easily be trained as a shrub or a tree. USDA Hardiness Zones 9 to 11.